Electric-current shunt.



Wit/messes W. L. BROOKS. ELECTRIC CURRENT SHUNT. APPLICATION IILBD NOVA, 1912'.

Patented June 23,1914" Irv/ember Waiiace L. BY; 0\ S D H L UNITED STATES PATENT OFFICE.

WALLACE L. BROOKS, OF SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIGCURIl-ENT SHUNT.

Specification. of Letters Yatent.

Patented June 2 1%14.

Appliention filed November 4, 1912. Serial No. 729542.

To all whom it may (no/awn:

Be it known that I, WAmnon L, Buoons, a. citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electrio- Current Shunts, of which the following is a. specification.

My invention relates to electric current shunts, and particularly to shunts for use in alternating current circuits carrying largo currents.

The object of my invention is to provide a shunt having negligible inductance.

The novel features which I believe to be characteristic of my improved shunt will be definitely indicated in the claims appended hereto. The principle of operation and de tails of construction will he understood by reference to the following description taken in connection with the accompanying lra wings which illustrate my invention and show an embodiment thereof, and in which Figure 1v illustrates ciiagmnnuatico.lly the present construction of a well known type of shunt; Fig. 2 illustrates diagramnnltirally the construction of my improved. non-inductive shunt of the some type; Fig. 5 an on lerged pcspective \liV; of" a n'urtical em bodiment of my lmention; Fig. 4 is an end elevation of n COIIlll'lGl'titll form of shunt em.- bodying the features of my invention Fig. is an side elevation of tl. a shunt shown in Fig. 4; and Fig. 6 is an enlarged sectionou the line 6 6 of Fig". "l.

My invention. will he most readily un-len stood. and appleclnted by cons'ldmlng {L typical form of electric current shunt em ployed at the promt time. and dingrmmnotically illustrated -11 Fig. 1 of the 1 rings. This shunt compris s a pair of terminals A and B, between which are connected the conducting members I. 'lhcse members gen orally conslst of strip; of short resistance metal. The width and number of these strips depend upon 'lho desired capacity of the shunt. The ends of the strips are con nected to the opposite terminals A and B, as

indicated in Fig. 1; so that the ends of the strips connected to one terminal are adjacent to one another, and similarly the ends of the strips connected to the other terminal are adjaceijlt to each other. By such a constir-notion it is evident that the current flows in a majority of the adjacent current conductors in the same direction. The inductive effect of the two middle conductorsran be made to neutralize each other, but the inductive effect of the outer conductors will not have such an ell'ect and the shunt as a Whole will accordingly have more or less inductunce.

My invention consists in arranging the conducting members in such a manner that the direction of the current flowing in any section of any conducting member is opposite to that of the current flowing in. any udjucent section of :1 conducting member. Such an arrangement of the conducting members is indicated diagrammatically in Fig. :2, whore A and ii represent the termi nnls ,XlHl (j' the coinlucting members. It will be seen from this figure that the ends of the conducting members are alternately connected to the respective terminals. By such an arrangement the. current in any two adjacent current conductors is opposite in direction, will the imlurtiro client of the current in one comluotmwill he neutralized by that of the (Zlflliiat in an adjacent comluctor if the conductors are placed near enough together. The nearer the adjacent conductors are brought togothen the greater will be the wutralizing elle t of one conrlljictor upon the adjacent conductors. The novel arrangemonk. which 1 have provided permits the con- (lm tm-l to be brought almost into contact with one number mul results in u shunt having; noorligiblc lllflllftzLIKK In Fig. 3 of the olrnulngs. l have shown on an enlarged scale oprm'tionl omhotlb wont f my invention. The terminal blocks ill and il ore ofpeculiur and novel (onslroction. litlk'll terminal bl ck i; prm'hlril uith :1 s ries of alternately po itioned com tort studs 1) and recesses 12%. The Contact studs may be integral nith the terminal blurfkg (w may be secured thereto in any suitable manner. Contact studs l2 of one terminal block are 'lpposite the recesses 13 of the other terminal block and accordingly the recesses of the former terminal block "of the end, of the attached conductor.

I similarly attached and dating material 21. sheets of are opposite the contact studs of the latter terminal block. Thus the contact studs of one terminal block are staggered with re spect to the contact studs of the other terminal block. The current conducting members 14 are U-sl1apcd and have a portion of one end attached to the com-act stud of one ter minal block and the other portion of the same end extending into the opposite recess of the other terminal block. The other end of the conducting member has a portion a portion similarly. extending into the adjacent contact stud and recess, respectively.

ave employed throughout the s ecification and claims of this application t e term conducting member to designate means for conducting the current from one terminal block to the other terminal block, while have used conductor to designate individually those portions of a conducting member carrying current in substantially opposite directions.

The preferred embodiment of my invention is shown in Figs. 4, 5 and 6. The ter-. minal blocks 10 and 11 of these figures are constructed the same as shown in Fig. 3. A reference to Fig. 6 will give a better understandin of the construction of theseterminal b ocks and the relation of the con: ductorsthereto. It will be seen from this figure that the contact studs 12 of each termlnal block are alternately positioned with reference to the recesses 13 of the same block and that the contact studs of one block are opposite the recesses of the other block. Contact studs 12 have an L-shaped offset of the same thickness as that of the conductors, so that the surface of the conductor is continuous with that of the contact stud. This ofiset serves for the reception of one portion 11- sulating material 15 is forced into or assembled in the spaces between the conductors and the terminal blocks and also in the space between the. terminal blocks themselves.

The conductin members shown in the cgnstruction of Figs. 4, 5 and 6 each consists o a air of conductors 16 of strips of sheet meta such, as manganin. The outer ends of these airs of conductors are electrically connected by small pieces of metal 17 secured thereto. The spaces between the conductors of the same conducting member and tween the conducting members themselves are filled with a thin layer or ,fihnLof insu- I prefer to? employ pure mica of about .005'inch thickness for t obvious that other insulating agents, such, for example, as lacquer, may be used if desired.

The adjacent conductors in which the our ...members to t e insulating material 21", but it is conductors are positioned, the more nearly will the inductive effect of the one conductor be neutralized by that of the other. The construction which I have shown in Figs. 4, 5 and 6 permits the conductors to be placed so near together that they may be regarded as substantially in contact. The thickness of the insulating material 21 between the adjacent conductors may be extremely small, for example, .005 or ess of an inch, since the voltage between the adjacent conductors is very low. Such a shunt is adapted to carry a very heavy current, for example, one thousand or more amperes, without appreciable inductive efect.

Each terminal blockis provided with a contact screw or screws 18 for attaching a leading-in wire. For convenience in adjusting the 1 resistance. of the conducting e proper value, a lug 19' may be fastened to or cast on each, terminal block and a thin strip of resistance material 20 may be connected between these lugs. This strip of-resistance material is convenient of access and can be filed or drilled to obtain final adjustment of the resistance of the shunt.

While I have herein shown and particularly described a preferred embodiment of my invention, it is obvious that changes may readily be made without departing from the spirit thereof, and I do not Wish, therefore, to be limited to the precise disclosures herein set forth.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. An electric current shunt, comprising a pair of terminals, a plurality of current 0011- ductors, and means for connecting the current conductors to the terminals so that the direction of the current-in anycurrent conductor is opposite to that of the current in any adjacent current conductor.

An electric current shunt, comprisin v a pair of terminals, a plurality of conducting members, ing two current conductors, and men 8 connecting said v terminals so that the direction of the cum, rent flowing in any conductor is oppositeto that of thecurrent flowing in any adjacent conduc r..

3. An electric current shunt, com rising a pair of terminals,-a plurality of -shaped conducting members connected between said terminals, said conductin members being arranged 'side'by side an so connected to the terminals that the direction of the current in any two adjacent current conductors is opposite.

4. electric current shunt, comprising a pair of lerminul blocks. each terminal block having: a plurality of contact sluds, lhe conincl. stiuls of: one terminal RlCKlX be ng slag-- gored Nil h respect to llir- (Uilitlfi tuds of lbs .5 olher terminal block, and a plurality of corn ducting mcuilbers. ouch condu ting member having one end scoured to u vonlzwr. stud of one 'icrminol block and the other end secured to on zuljacrnt (folilil lflstud oi the other ter 10 urinal block.

so o l n 1 ml I). in cl rir current shunt. comprising :1 Pull of lo .inil lmzlrs. ouch terminal block lowing a ;.llll2llli of ronlur studs, the conlirici sluds of one terminal block bring slag- :d with rcspccl to th c ol :wcl' sleds of she I terminal block, and 12 plurality of U- :zl conducling members, each member I one and clcivusil y (lull'iliilf'il to :1 L sud of one lmmiuul block and in from l'lie oi er iermirm block and The illl'wl" end. connm d lo on m'ljacent stud oil lbe bilier tribunal block illlil insulated iron; the former criminal blol'rli.

(1. A nominal block for nn clccrric current 5 shout ho ing s pluruluy of conic-ct studs will: an iuleri'ei'iing space between adjacent Sill: 1:. mail winnn'ftv stud having a recessed pn: lion, and a current conductor having one end social in the recessed portion of each stud and secured to the stud, the space becurcu adjacent, sands being wide enough to accommodate one end of a current conductor wiiuoot elei'zlricsl contact with either adjawon Mu l.

flea-mic current shunt, comprising a. z: plurulily of conducting d from each olher by a 1; layer if ami=luu,. materiz and. means lug lilo (Ollll lingnicmberstothe v'xl'lilllllll that. the directi n of the current in any sec-lion of any :"i'u'ulu j ring member is co c-silo to that of the current in any adjaccnl: section of a col-ducting member.

s. An electric current shunt, comprising a pair of terminals, a. plurality of conducting members, each conducting member comprising no current. condiuzlors, and means for connecting said conducting members to the terminals. said currenl. conductors being {I arranged near in but insulated from each other and so than; the direction. of the cur- :cnl flowing any ltiH'KlLli'llOl. is opposite to lhui m lflu; c rent Scoring in any adjacentconductor.

' .i electric can-rem shunt, con'lprising u pun ici'niiouls, 21 plur: .ily of U-shupcd conducting members connected between said terminals. sa d l j members being arranged side by o bu insu- 0 line. from Cliifli -llmr and o -.'onne 'l.c:i to on of she cur the terminals thm. the din rent in any two adjacent ((JHlllllflflF-S is oopssite.

10. An electric currentsliunl, comprising :1 pair of lcrnlinal blocks, each terminal. block having a plurality of contact studs, the coniurt studs of one terminal block being slaggmvd with respect to the contact studs of the other terminal block, a current conduccor connected to each Contact stud, said current conductors being arranged side by side and separated from each other by a thin layer of insulating material, and means for electrically connecting said conductors in pairs so that the current in any two adjacent conductors is opposite in direction.

H. An electric current shunt, comprising a pair of terminal blocks, each terminal block having alternately arranged contact studs and recesses, the recesses and contact studs of one terminal block being opposite the contact studs and recesses respectivel of the other terminal block, a plurality oi U shaped conducting members, each conducting member having :1 portion of one end so cured to the contact stud of one terminal block and the other portion of the same end insulatively secured 1n the opposite recess of the other terminal block and having a portion of the other end insulatively secured in a recess adjacent to said above mentioned contact stud of the former terminal block and the other portion of the last mentioned end secured to a contact stud adjacent to said above mentioned recess of the latter terminal block.

12. An electric current shunt, comprising a air of terminal blocks, each terminal block liaving alternately arranged contact studs and recesses, the contact studs and recesses of one terminal block being opposite the re cesses and contact studs respectively of the other terminal block, e plurality of current conductors, each conductor having a portion of one end secured to a contnclstud on one terminal block and the other portion of the same end extending into the opposite recess of the other terminal block, means at the op posite end of the conductors for electrically connecting them in pairs so that the current in any two adjacent conductors is opposite in direction, and means for insulating the portion of a conductor extending into a. recess of a. terminal block from such terminal block.

1.3. An electric current shunt, comprising a pair of terminal blocks, each terminal block having alternately arranged cont-act studs and recesses, the contact studs and recesses of one terminal block being opposite the recesses and Contact studs respectively of the other terminal block, a plurality of current cmiductors arr-unwed side. by side and near to but. insulated rom each other, each conductor having a portion of one end secured to a contact-stud on one terminal block and rho other portion of the same end extending into the. opposite recess of she other terminal block, means at the opposite end In witness whereof, I have hereunto set of the conductors forelectricaylly connecting my hand this 31st day of October, 1912.; t em in pairs so that the current in any two adjacent conductors is opposite -1n direc- WALLACE BROOKS 5 tion, and means for insulating the portion Witnesses:

of a conductor extending into a recess of a HELEN ORE-0RD,

terminal block from such terminalblock. MARGARET E. WOOLLEY. 

